纳米二氧化钛改性LDPE薄膜中纳米钛粒子在食品模拟物中的迁移研究

为探究纳米改性LDPE薄膜中纳米钛粒子在食品模拟物中的迁移规律,根据欧盟法规(EU)NO.10/2011,分别采用蒸馏水、3%乙酸溶液(m/V)、10%乙醇溶液(V/V)、95%乙醇溶液(V/V)作为中性、酸性、脂肪性和酒精性食品模拟物,研究在不同温度条件下(40℃和70℃)纳米钛粒子的迁移情况,并研究了微波和紫外处理对迁移结果的影响。研究发现,纳米钛粒子在四种食品模拟物中的迁移量从高到低依次为:酸性食品模拟物、中性食品模拟物、酒精性食品模拟物和脂肪性食品模拟物,并且温度的升高能够促进纳米钛粒子的迁移。纳米钛粒子的迁移量范围为0.0046 mg/kg~0.61 mg/kg。此外,微波处理也能够促进纳米钛粒子的迁移,紫外处理则没有这样的促进作用。根据欧盟规定所允许的最大迁移量5 mg/kg,迁移实验表明纳米二氧化钛改性LDPE薄膜能够作为一种安全的食品包装膜。

Migration of Ti in Nano-TiO2 Modified LDPE Films into Food Simulants

In order to study the migration of Ti into food simulants from nano-TiO2 modified LDPE films , the effects of different temperatures, microwave and ultraviolet treatment on the migration were studied based on the (EU) NO. 10/2011 using, distilled water, 3% acetic acid (m/V), 95% ethanol (V/V) and 10% ethanol (V/V) as the neutral, acidic, fatty and alcoholic food simulants, respectively.. The results indicated that the highest migration of Ti was in acidic simulants, followed in neutral, alcoholic and fatty simulants,, and the increasing temperature could promote the migration of Ti particles. The migration of Ti ranged from 0.0046 mg/kg to 0.61 mg/kg. Moreover, microwave treatment could also promote the migration of Ti particles, while ultraviolet had no such promotion. According to the maximum migration of Ti with 5mg/kg allowed by (EU) NO.10/2011, the results of migration test showed that LDPE films modified by nano-TiO2 might be used as a kind of safe food packaging film.